Rigid Foam Board Roof Insulation

It is denser than eps and provides more r value with a rating of 5 per inch of thickness.

Rigid foam board roof insulation.

Install rigid insulation board in multiple layers with joints offset vertically and horizontally between adjacent layers. This foam board insulation is available with straight or tongue and groove edges to help limit air movement. R matte plus 3 thermasheath 3 is rigid foam plastic thermal insulation r matte plus 3 thermasheath 3 is rigid foam plastic thermal insulation board composed of environmentally sound closed cell polyisocyanurate foam bonded to a durable white matte non glare aluminum facer and a reflective reinforced aluminum facer. Once the roof demo was complete and the flat roof was cleared of any remaining debris some rotted 2x material around the perimeter of the roof was replaced.

This foam board insulation is the rigid pink or blue panels that can be found at home centers in many different thicknesses. In other words rigid foam can be applied on walls foundations and roofs and works great for both retrofits and new constructions. This product is suitable for use in wall sheathing applications in new. Install nailbase for cladding.

If you want to install rigid foam above your roof sheathing in climate zone 3 then 1 2 inch of rigid foam board is not ideal this rigid foam layer needs a minimum r value of r 5 and that s impossible with 1 2 inch of foam. As my article states you need a minimum of about 1 5 inch of eps 1 inch of xps or 1 inch of polyiso.